Hamamatsu C3704 series UV TRON driving circuits are low current consuming, signal processing circuits for the UV TRON Flame Detector, well known as a high sensitivity ultraviolet detecting tube. The C3704 series can be operated as a UV sensor by connecting the UV TRON and applying DC low voltage, as they have both a high-voltage power supply and a signal processing circuit on the same printed circuit board.

Since background discharges of the UV TRON caused by natural excitation lights (such as a cosmic ray, scattered sunlight, etc.) can be cancelled in the signal processing circuit, the output signals from the C3704 series can be used without errors.

When the high sensitivity sensor "UV TRON R2868" (sold separately) is used, the flame from a cigarette lighter (flame length: 25mm) can be detected even from a distance of more than 5m.  The UVTron and Driver board can be bought together in a package. 

For Additional Information see Hamamatsu’s Data sheet.  For Assembly See our Assembly/Information page.  For an example OOPic program see our downloads page.

PRECAUTIONS FOR USE

• The UV TRON requires high voltage and the user must take any necessary precautions to protect yourself and others from any risks associated with electrical safety.
• Since the operation impedance is extremely high, the UV TRON should be connected as close as possible to the circuit board within 5 cm.
• Take care to avoid external noise since C-MOS IC is used in the circuit. It is recommended that the whole PC board be put in the shield box when it is used.
• To reduce current consumption, oscillating frequency is very low (approx. 20 Hz) in this DC-DC converter. Thus, the output impedance of the high voltage power supply is extremely high. If the surrounding humidity is high, electrical leakage on the PC board surface may lead to a drop in the supply voltage to the UV TRON. This voltage drop may result in lowered detection performance, so a moisture proof material (silicone compound, etc.) should be applied at the connecting point of the UV TRON, etc., if using the unit in a humid environment.